Definition of headwaters noun from the Oxford Advanced American Dictionary

 

headwaters

 noun
noun
NAmE//ˈhɛdˌwɔt̮ərz//
 
, NAmE//ˈhɛdˌwɑt̮ərz//
 
[plural]
 
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streams forming the source of a river
See the Oxford Advanced Learner's Dictionary entry: headwaters